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Liquid-level controller for oil-and-gas separators

| By Mary Page Bailey and Gerald Ondrey

The Fisher Fieldvue L2t liquid-level controller pairs with an electrically-actuated control valve to reliably maintain ideal separator levels. Compared to alternatives using electric on-off valves, the new Fisher controller makes it possible to save significant energy and maintenance costs by minimizing valve movement, and by simplifying the level measurement and control processes. The L2t uses a displacer to measure level and level interface, while executing a single-loop control algorithm to drive an electrically-actuated control valve. The device is simple and inexpensive to install, and there are no emissions since the valve is actuated by electricity instead of natural gas pressure. — Emerson, St. Louis, Mo.